import pymysql
class Db:
    def __init__(self) -> None:
        self.conn = pymysql.connect(host='localhost',port=3306,user='root',
        password='123',db='p8',cursorclass=pymysql.cursors.DictCursor)
        self.cursor = self.conn.cursor()

    def find(self,sql):
        self.cursor.execute(sql)
        res = self.cursor.fetchone()
        return res

    def find_all(self,sql):
        self.cursor.execute(sql)
        res = self.cursor.fetchall()
        return res

    def update(self,sql):
        self.cursor.execute(sql)

    def commit(self):
        self.conn.commit()


    def rollback(self):
        self.conn.rollback()

db = Db()